Potassium is element number 19 on the Periodic Table of the Elements. In the case of K , a Potassium atom acquires a charge of +1 to enter its noble gas electron configuration. You can tell this because it is found in Group 1 of the Periodic Table of the Elements.

Key Points

1. The electronic configuration of many ions is that of the closest noble gas to them in the periodic table.
2. An anion is an ion that has gained one or more electrons, acquiring a negative charge.
3. A cation is an ion that has lost one or more electrons, gaining a positive charge.

A cation is a positively charged ion with fewer electrons than protons while an anion is negatively charged with more electrons than protons. Because of their opposite electric charges, cations and anions attract each other and readily form ionic compounds.

Chemicals in the body are “electrically-charged” — when they have an electrical charge, they are called ions. The important ions in the nervous system are sodium and potassium (both have 1 positive charge, +), calcium (has 2 positive charges, ++) and chloride (has a negative charge, -).

Answer: Atomic number of k = 19, We see that, Pottasium(k) has 1 electron in it’s outermost shell, So k+ will have, 8 outermost electrons, According to Octet rule, K+ will be more stable !.

[Ar] 4s¹

Explanation: A potassium atom, K is in its normal elemental state with 1 valence electron in it’s most outer shell. However the potassium ion has lost it’s valence electron and has therefore formed a positive action, K+ . It instead has 19 protons and 18 electrons, yielding a net positive charge.

Following is a list of some of the more important ions in the cells and fluids of our bodies:

• Sodium ions are the principal cations found outside cells in the body.
• Potassium ions are the principal cations found inside cells in the body.
• Chloride ions are the principal anions found outside cells in the body.

When it becomes ion as K+, so due to lose of electron, it has 19-protons & 18-electrons. Due to excess of proton in potassium ion, electron-proton attraction becomes dominant which makes its size smaller as compared to potassium atom which is basically neutral having no charge. .

Therefore, the ion of potassium has a +1 charge. +1 charge means that potassium atom has lost 1 electron. Therefore, a potassium ion has a smaller radius since it has less electrons.

Since potassium is located at the start of period 3, and bromine at the end of the same period, potassium will have a larger atomic radius than bromine, and thus the largest atomic radius of the four given atoms.

These are electrons with “highest energy level”. When at neutral, the potassium ion in the form of K has an electronic configuration of: The K+ ion has its outermost electrons on the third energy level now and is size is smaller than that of K ion. Hence, K is larger than K+.

Generally, the atomic radius increases down the group. Both Rb and Na are in the same group, group 1. Rb is below Na and thus we expect Rb to have a…

The ionic radius of the Sr2+ ion is 132pm, while the ionic radius of the K+ ion is 152pm. Why is this the case? I would have thought that since K+ has one less shell of electrons than Sr2+, its radius would be significantly smaller.

Helium

So, in the end, we can conclude that nickel ions have a minimum radius. So, the correct answer is Option C. Note: While comparing the ionic radius, we should consider all the points.

Francium

cesium

Of solid and liquid elements at normal temperature and pressure, the least metallic are those at upper right of the Periodic Table: carbon, phosphorus, sulfur, bromine and iodine. Carbon in some of its allotropic forms has one property in common with metals; it is a good conductor of electricity.

fluorine

Cesium is the farthest left and the lowest, while fluorine is the farthest right and the highest, so we know they have the highest metallic character and the lowest metallic character, respectively.

Iodine

Cesium